Remove HiResEventTimeStamp runtime flag (status=stable)

third_party/WebKit/Source/core/events/Event.cpp

 /*
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2005, 2006, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 65 matching lines @@
     , m_propagationStopped(false)
     , m_immediatePropagationStopped(false)
     , m_defaultPrevented(false)
     , m_defaultHandled(false)
     , m_cancelBubble(false)
     , m_wasInitialized(true)
     , m_isTrusted(false)
     , m_handlingPassive(false)
     , m_eventPhase(0)
     , m_currentTarget(nullptr)
-    , m_createTime(convertSecondsToDOMTimeStamp(currentTime()))
     , m_platformTimeStamp(platformTimeStamp)
 {
 }
 
 Event::Event(const AtomicString& eventType, const EventInit& initializer)
     : Event(eventType, initializer.bubbles(), initializer.cancelable(), initializer.composed() ? ComposedMode::Composed : ComposedMode::Scoped, monotonicallyIncreasingTime())
 {
 }
 
 Event::~Event()
@@ skipping 230 matching lines @@
     if (node && node->isSVGElement()) {
         if (SVGElement* svgElement = toSVGElement(node)->correspondingElement())
             return svgElement;
     }
     return m_currentTarget.get();
 }
 
 double Event::timeStamp(ScriptState* scriptState) const
 {
     double timeStamp = 0;
-    // TODO(majidvp): Get rid of m_createTime once the flag is enabled by default;
-    if (UNLIKELY(RuntimeEnabledFeatures::hiResEventTimeStampEnabled())) {
-        // Only expose monotonic time after changing its origin to its target
-        // document's time origin.
-        if (scriptState && scriptState->domWindow()) {
-            Performance* performance = DOMWindowPerformance::performance(*scriptState->domWindow());
-            timeStamp = performance->monotonicTimeToDOMHighResTimeStamp(m_platformTimeStamp);
-        }
-    } else {
-        timeStamp = m_createTime;
+    if (scriptState && scriptState->domWindow()) {
+        Performance* performance = DOMWindowPerformance::performance(*scriptState->domWindow());
+        timeStamp = performance->monotonicTimeToDOMHighResTimeStamp(m_platformTimeStamp);
     }
 
     return timeStamp;
 }
 
 void Event::setCancelBubble(ExecutionContext* context, bool cancel)
 {
     if (!m_cancelBubble && cancel)
         UseCounter::count(context, UseCounter::EventCancelBubbleWasChangedToTrue);
     else if (m_cancelBubble && !cancel)
         UseCounter::count(context, UseCounter::EventCancelBubbleWasChangedToFalse);
     m_cancelBubble = cancel;
 }
 
 DEFINE_TRACE(Event)
 {
     visitor->trace(m_currentTarget);
     visitor->trace(m_target);
     visitor->trace(m_underlyingEvent);
     visitor->trace(m_eventPath);
 }
 
 } // namespace blink